Preventing Rounded Corners when Expanding

When you expand a rectangular selection and stroke it by more than a pixel, you might have noticed that the stroke acquires rounded corners (Figure 9-12). This is not caused by a setting that you might have overlooked; it's just the way the feature works. To prevent this unwanted side effect, you can employ one of the following three workarounds:

Figure 9-11: A selection being warped by using the Edit^ Transform Selection ^ Warp command; A—Corner handle. B—Original selection bounding box. C—Control point.

1. Stroke inside the selection but be prepared to lose some of your image content.

2. Expand the selection in one-pixel increments and then stroke inside. To do so, choose Select ^ Modify ^ Expand. If you need to modify by a large amount, create an action and run it on the selection as many times as necessary (see Chapter 15).

3. With the selection active, enter Quick Mask mode. Choose Filter ^ Other ^ Maximum and enter the number of pixels by which you want to expand the selection. Exit Quick Mask mode and then stroke inside without fear of rounded corners.

Figure 9-12: Rectangular selection produces rounded corners when stroked on the outside.
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